Question 175929
{{{system(x+2y   =6,
7x+3y+z=-33,
x    -z=16)}}}
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There are many ways to solve systems of equation.
If you will re-post and tell us the method you are
studying we will go thru it step by step.  But
I'll just give you the solution now:

{{{matrix(1,7,
 
   "(x,", "y,", "z)",   "=",   "(-4,", "5,", "-20)" )}}} 

Edwin</pre>